I cannot comment on their ability to make concrete shine, but this past week I was helped by a couple Good Samaritans wearing matching Nelson Concrete shirts. Robert and another young man who was with him changed my blown out tire for me and my 3 little boys while I was traveling from MN to IL. If I lived closer, I'd absolutely hire them. They were so kind and helpful. It's not often you find someone who will help someone out in a time of need without even being asked. Thank you!